Piston.



No. 872,786. 'PATENTED DEC. '3, 1905.

E. H. BBAZBLL.

PISTON.

APPLICATION HLED MAR. 20, 1967.

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Patented Dec. 3, 1907.

Application filed March 20. 1907. I Serial No. 363.374,

To all whom it may concern:

of annular l'orm, but they could be construot- Be it known that I, EDWINll. Bnazntt, a cd with an irregular, or polygonal, periphery citizen ofthe United States, residing at (Janonsburg, in the county of Washingtonand State of Pennsylvania, have invented certain new and usefullmproiwnicnts in Pistons, oi which the following is a s 'ieciiication.

My invention relates to improvements in pistons, and it consists in theconstructions, ombinations and arrangements herein described andclaimed. v

The object of my invention is to provide a durable and inexpensive formof piston operating with a minimum of friction, and in which the wearand leakage occurring in the use of existing types of pistons will beeliininated.

In the accom anying drawings, forming a part of this app ieation, and inwhich similar reference symbols indicate oorresponr ling parts in theseveral vimvs, Figure 1 is a sectional view, illustrating one embodimentof my inventioi'i adapted for the trunk piston oi j an air drill; Fig. 2is a sectional yicw on the lino 2-2 oi Fig. 1; and i l". 3 is sideclevation of the construction shown in Fig. 1.

Referring to the drawings, lv have shown a piston head comprising acylindrical member 1 provided with a peripheral llan ge 2 on its outerend, and having a threaded boss 3 extending coin. .ntrically from itsinner end; said member beingprovided with a conical bore 4 forpermitting the swing of a piston rod 5.

A cylindrical member 6, having a peripln eral flange? on its outer end,provided with a threaded bore 8 on its inner end for roceivint, thethreaded boss 3; the boss and bore con.

stituting threaded telescoping portions for screwing together saidcylindrical i'nembers with a continuous .eriphcral seat between theirflanges i'or pacicing he inner ends of the two c ylindrioal memhers areprovidd with regi'tering recesses for receiving planes 9 and i O whichare formed to constitute a bearing; for the spherical head 11 of thepiston, rod his shown espeoiaily in Fig. 1, the hearing plates 9 and 10are securely olan' ied in position between the (3 when the letter arescrewed members 1 an together. The bearing plates, which receive allWear of the piston rod, are 'irolcrably formed of tempered, or hardened,steel thereby permitting the cylindrical members 1 and 6 to be formed ofmalleable castings, or soft/steel. I here shown the bearing plates l l il l l l l l eral parts are securely locked for iositindy locking themagainst turning in their recesses.

A series of split packing rings 12 are clamped together between theperipheral flanges ol' the cylindr' al uiembcrs 1 and (i when the latterare screwed together. The packing rings are lormed of a fibercomposition, such as is supplied to the trade in the form-of sheets orboards. 1 preferably con struct the split rings with a width ofapproxiniatcly onc-l'ourth inch; a suitable spacelff being showncompensate lorexpansion and prevent injury to the ring ends t ture andother conditions occurring in practice After the packing rings havebeensecurcly clamped in position by tightly screwing together the twocylindrical members 1 and 6, a series of rivets 14 are inserted betweenthe ends of each ring to' hrough the action of moisihmgcs 2 and 7. Thisconstruction insures great pormanci'icy and durability, in that the.

rivets rigidly secure the packing rings on the periphery of thecylindrical members-and also positively lock said members againstaccidentally becoming unscrewed. 1t will be obvious that bolts, or otherretaining means, could be substituted for the rivets 14, but rivets haveproven in practice to be a very advantageous construction.

From the above described construction, it will be seen that myin'vei'ition. provides a very durable construction, in which thesevagainst displacement. Myinvention-has provcn especially advantageousin pneumatic devices, such as air drills and compressors; the fiberpacking rings maintaining a fluid. tight fit within the cylinder withslight friction, and a minimum of resulting; wear and deteri oration.

The scoring and injury caused by hard metal packing rings in cast ironcylindersreferred vio usl y, and

its 872,786

Having thus described In invention, What I claim new therein an desireto secure by Letters Patent is:

1. A piston comprisingcylindrical members provided with peripheralflanges and with recesses for bearing plates, packing rings on theperipheries of said members, bearing plates in said recesses, an d meansfor securing said members togetl'ier for clamping the packing ringsbetween said flanges and substantially as described.

A piston eon'iprising cylindrical mem-- bers provided with peripheralflanges and with recesses for ljiearing plates, a series of split fiberpacking-rings on the peri heries of said members, bearing plates in saidrecesses, means for securing said. members together for clamping theseries of rings between said flanges and simultaneously clamping said.bearing plates in their recesses, and a com- I clamping seid bearingplates in their recesses, I

men means for securing said packing rings in position and positivelydrical substantially as described.

locking said cylinmembers in their secured position,

' 3. A piston comprisingcylindrical members provided with peripheralflanges, a series of split fiber ripheries of engaging portions on saidmembers for seeuring them together and provided with recesses, bearingplates in said recesses and a common means rings in position andpositively locking said I members against accidentally substantially asdescribed.

packing-rings on the esald members, screw-threa ed for securing saidecking in testimony whereof I aliix my signature presence of twoWitnesses.

EDWIN H. BEAZELL. Witnesses J. A. A. CRAIG, E. G. 0. Gwen.

unscrewing, r

